What is the pH after adding a base?

  • Thread starter Thread starter megzb
  • Start date Start date
  • Tags Tags
    Base Ph
AI Thread Summary
The discussion revolves around calculating the pH of a solution after titrating a nitrous acid solution with barium hydroxide. The initial moles of nitrous acid and barium hydroxide are provided, with the user expressing confusion about how to proceed after determining these values. Key points include the importance of assuming complete neutralization and using the Henderson-Hasselbalch equation to find the concentrations of the remaining acid and the produced conjugate base. The conversation emphasizes the need to treat this as a limiting reagent problem, where the final concentrations can be calculated based on the amounts of acid and base used, along with the final volume of the solution. Additionally, it highlights the relevance of molarity in determining concentrations and suggests using calculators for pH and stoichiometry to aid in the calculations.
megzb
Messages
2
Reaction score
0
This is my question:
When a 17.9 mL sample of a 0.493 M aqueous nitrous acid solution is titrated with a 0.476 M aqueous barium hydroxide solution, what is the pH after 13.9 mL of barium hydroxide have been added?
I'm not really sure how to start it?
I have the moles of the acids and the base.
[acid]=8.8247E-3
[base]=6.6164E-3
but after that I'm lost! Help would be greatly appreciated!
 
Chemistry news on Phys.org
Classic buffer question. Assume neutralization went to completion, calculate concentrations of acid and conjugate base, use Henderson-Hasselbalch equation.

--
 
Stoichiometry. You start with some amount of nitrous acid. You add some base. If neutralization went to completion, you are able to easily calculate amount of the acid left, and amount of conjugate base (product of the reaction) - this is just a limiting reagent question. You know amounts, you know the final volume - just plug and chug.

--
methods
 
The molarity of your acid/base is given. Molarity = Moles/Liter IS your concentration.
 
Note: in case base is in excess all acid was neutralized, and it is just a limiting reagent question.

--
 

Thread 'Humidity of a saturated NaCl solution with anticaking additive'

I want to test a humidity sensor with one or more saturated salt solutions. The table salt that I have on hand contains one of two anticaking agents, calcium silicate or sodium aluminosilicate. Will the presence of either of these additives (or iodine for that matter) significantly affect the equilibrium humidity? I searched and all the how-to-do-it guides did not address this question. One research paper I found reported that at 1.5% w/w calcium silicate increased the deliquescent point by...
View full post »

Thread 'Why does having 8 valence electrons make an element inert?'

I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
View full post »

Thread 'Resists for etching Aluminium with NaOH'

I'm trying to find a cheap DIY method to etch holes of various shapes through 0.3mm Aluminium sheet using 5-10% Sodium Hydroxide. The idea is to apply a resist to the Aluminium then selectively ablate it off using a diode laser cutter and then dissolve away the Aluminium using Sodium Hydroxide. By cheap I mean resists costing say £20 in small quantities. The Internet has suggested various resists to try including... Enamel paint (only survived seconds in the NaOH!) Acrylic paint (only...
View full post »

Similar threads

TiO2 Photocatalyst to replicate making a photocatalytic PVA film
Replies
0
Views
2K
Something that doesn't make sense to me about calculating the pH
Replies
14
Views
3K
How do I calculate the pH of slime and its effect on viscosity?
Replies
2
Views
3K
How can I prepare a 0.1M NaOAc buffer at pH 5 using titration?
Replies
4
Views
5K
Chemistry How to calculate pH at equivalence point using this alternative?
Replies
7
Views
1K
Chemistry Are there typos in this snippet causing confusion?
Replies
2
Views
1K
Chemistry Moles of NaOH to Create Buffer Solution pH=6 in 0.42M Ethanoic Acid
Replies
3
Views
3K
Chemistry How to take into account autoprotolysis in weak base solution?
Replies
8
Views
2K
Does Adding HCl Change the pH of a CH3COOH/CH3COO Buffer?
Replies
1
Views
4K
Chemistry Comparing methods of computing pH at equivalence point in titration
Replies
4
Views
1K

Hot Threads

Recent Insights

Back
Top